Doug Ryden 99th St. School

Carefully put the bottom ends of vertical supports into cups and fill with sand or dirt. This will help hold them up while putting the bridge together. Set the vertical supports 50 cm a part. Tie two strands of yarn from each section letting the yarn dip evenly on both sides, but not more than 25 cm from top of vertical support. Tie one end of two pieces of yarn to each vertical support at the ends and tie the other ends of yarn to 2 liter "Coke" bottles filled with water. This should allow vertical supports to stand by themselves. Glue 2 pieces of yarn 30 cm long to each side of road section 5 cm a part. Place road section inside vertical support. You can use text books to hold road section in place (about 14 cm from floor). Tie each of the 2 pieces of yarn on road section to yarn on vertical support. Cut off excess yarn. Remove books. Make minor adjustments and... You have made a Suspension Bridge!!